/*
 * Copyright 2015 GenerallyCloud.com
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.generallycloud.nio.codec.http11;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import com.generallycloud.nio.buffer.ByteBuf;
import com.generallycloud.nio.codec.http11.future.HttpReadFuture;
import com.generallycloud.nio.protocol.ProtocolEncoder;

/**
 * @author wangkai
 *
 */
public abstract class AbstractHttpProtocolEncoder implements ProtocolEncoder {

	protected static final byte[]	RN		= "\r\n".getBytes();
	protected static final byte	COLON	= ':';
	protected static final byte	SPACE	= ' ';

	protected void writeBuf(ByteBuf buf, byte[] array) {
		writeBuf(buf, array, 0, array.length);
	}

	protected void writeBuf(ByteBuf buf, byte[] array, int offset, int len) {
		if (buf.remaining() < len) {
			buf.reallocate(buf.position() + len, true);
			buf.limit(buf.capacity());
		}
		buf.put(array);
	}

	protected void writeBuf(ByteBuf buf, byte b) {
		if (!buf.hasRemaining()) {
			buf.reallocate(buf.capacity() + 1, true);
			buf.limit(buf.capacity());
		}
		buf.putByte(b);
	}

	protected void writeHeaders(HttpReadFuture f, ByteBuf buf) {

		Map<String, String> headers = f.getResponseHeaders();

		if (headers == null) {
			return;
		}
		
		Set<Entry<String, String>> hs = headers.entrySet();
		
		for (Entry<String, String> header : hs) {
			writeBuf(buf, header.getKey().getBytes());
			writeBuf(buf, COLON);
			writeBuf(buf, header.getValue().getBytes());
			writeBuf(buf, RN);
		}
	}

}
